Combined front and side shackle block



Aug, l, 1950 P. VAN H. SERRELL 2,517,249

COMBINED FRONT AND SIDE SHACKLE BLOCK Filed Sept. 27, 1946 l INVENTOR. Perm K1A/146m: man

agitar-7gg Patented Aug, 1, l9195i) UNITED s'lrrrisis PATENT ortica COMBINED- raom: Ann sinnI4 sagoma.

i BLOCK Peter: VanHorne Serrellt, Pasadena, Salifr plllicatin Septeml 27, 1946Selfia1N0. 699,780

5 Claims.n (Cl. 254.-1950' My invention relates" toi blocks used hoisting tackle. and particularly to* blocks fitted with shackles; enabling it to be mounted with the which the holes for the shacklepinares'provided` in a tang or solid piece of metal positioned between side plates formihg the shell of the block, thus adding to the weight ofthe block and to the: number of parts of which it is comprised withv consequent increase in costof manufacture l ItY is;` an object of this invention to provide a shackle block comprising a. minimum of parts While maintaining the` flexibility of installation of the type of shackle block referred to.

It is aL further object ofthe` invention to pro'- vi'de l a` shackle block which may be manufactured in a minimum number of operations, but which produces a block of a high degree of accuracy of the parts.

It is yet another object of the invention to provide a shackle block of the type described, of lighter weight for the same load carrying capacity than has hitherto been attained.

Another object of the invention is to provide a process of producing shackle blocks in a minimum number of operations but with a better utilization of material than has been heretofore possible.

Under certain conditions a swivel block is of advantage and accordingly a further object of the invention is to provide a swivel block utilizing the one piece shell construction lpreviously referred to with supplementary parts of simple yet rugged construction.

The invention is illustrated in the accompanying drawings in a form at present deemed preferable by me.

In the drawings:

Fig. 1 is a perspective View showing the tackle block of my invention, and

Fig. 2 is a section of the line 2--2 on Fig. 1;

Fig. 3 is a section on the line 3 3 on Fig. 1;

Fig. 4 is a section on the line 4-4 on Fig, 3;

` twisting together as may Fig; 5 is a perspect'ivev viewof the shackle` drawn to a larger scale; and

Fig; 6 is a fragmentary sectionI through. the head portion of the block, showingy a modiiicatiorr thereof' providingfa swivel bl'oclt.

In the drawings, the numeral il@ indicates a one piece shell formed integrally4 with a rectangular head`` section- Illu; which is: provided with aligning holes' i0?) formedV in opposite sidest III-1 order tosecure a straight transfer of' force between the shackle I2 and shackle pin Mi placed.V

in the holes and the sheave 2101 supported in the sid'e-` plates- Ic' of,` the shell,` aE pair of` Walls of the head section wir are arranged to lie sub` stanti'ally inl thefplane of the corresponding side:

plate IIIe;

The shackle' 'F2 is mounted ori the`j ends or the .pin I4 projecting front the side of` the head por tions of the block. The provision of holes; i-n sides* of the1 head atfrighii angles to one4 another enables theblock to be aligned with'- the direrr` tibnJ of' the line running through the block with-` out necessitating the use of a swivel andi the..` attendant danger of the line becoming fouled happen' when" using a new line. l

In Figs: e and 5; a construction isfshown which may' be utilized should theblock-be` intended fbr" heavy loads, in which case the sheet material, of which the shell is formed, might Wear around the holes in which the shackle pin is arranged, in view of the heavy loads imposed at this point. As shown in Fig. 4, the holes may be punched or broached to provide a at Id, and the` shackle pin I4 is ground on one side to a corresponding flat contour I4a. The shackle pin is thus prevented from rotating in the hole, but sufficient cylindrical surface is left at the end of the pin to afford an adequate bearing surface for the shackle I2 which is preferably of heavier material than the shell of the block, thus wear on the edges of the hole is avoided, and is taken by the heavier metal of the shackle and pin. The shackle pin may be retained in position by a cotf ter pin I8 positioned in a hole drilled in through the ends of the pin, or as shown in Fig. 5, the pin may be provided with a head at one end.

The sheave 20 may be positioned by placing the pivot pin 22 in position therein and bringing the side plates apart suiliciently to enable the pin to be positioned in holes drilled to receive the ends of the pin. The side plates may then be brought into parallelism and the ends of the pin riveted or spread into secure engagement with the side plates as indicated at 22h. In all forms e ,I 3 of the block I prefer to drill the sheave pin axially as indicated at 23 to provide for lubrication of the sheave which turns on the pin, a radial hole being drilled through the pin on the low pressure side to lead lubricant to the bearing of the sheave on the pin.

The shell of the block and the head portion are perfectly formed from a single piece of metal blanked to the propershape and the head formed by a drawing operation;

It is to be noted that the form of the head provides a very rigid member, in the form of an open sided box, the walls being held in properly spaced relation by the top wall, which is integral with the walls forming the side plates and with the walls extending at right angles to the side plates of the block.

In Fig. 6 the locating hole 24 shown in Fig. 1

is reamed out as indicated at 2G to receive a screw A 28 which is threaded in to a block of metal or swivel base 30. A hole 32 is drilled through the block for a clevis pin 34, the hole being drilled to intersect the screw 28 threaded into the block and thus the screw is securely held against loosening in the block when the clevis pin 34 is inserted in bore 32. v v

A yoke 36 is mounted on the clevis pin 34 in a similar manner to that described with reference to the form of theinvention shown in Fig. 1,

Preferably a wear plate 38 is interposed between the head 28a of the screw and the head portion 4U of the block shell.

While I have described and illustrated preferred forms of the invention, it is to be understood that various changes and modications may be effected by those skilled in the artwithout departing from the scope of the invention as indicated by the attached claims.

Iclaim: y

1. A tackle block comprising in combination an integral shell formed to provide parallel side plates anda head of rectangular cross-section joining said plates at corresponding ends thereof, a pivot pin mounted on said plates, a sheave borne by said pin betweensaid plates, said head having formed therethrough pairs of relatively right angularly related clevis pin receiving apertures and a clevis pin selectively mounted in one pair of said apertures, and a shackle carried by said clevis pin.

2. A tackle block as set forth in claim 1, in which the head is formed by the right angular bending of the side plates so as to form a four sided boxlike enclosure in which the apertures are formed.

3. A tackle block comprising in combination a single, integral stamping `formed to provide a pair of spaced parallel side plates and a four sided boxlike head, two parallel sides of which are formed by the abutment of inturned portions of said side plates, clevis pin apertures formed in said head, a sheave pin borne by said side plates and a sheave mounted on said sheave pin and enclosed by said plates.

4. A tackle block as set forth in claim 3 in which the clevis pin apertures are formed by indentures in the abutting inturned edges of said side plates.

5. A tackle block comprising: a shell formed of an integral piece of sheet metal and having correspondingly formed spaced side plates and ya head bent from and connecting said side plates with spaced sides and a connecting end web and also bent to provide opposite side portions for closing the spaces between said sides of the head,-

and a sheave rotatably mounted between said side plates and a clevis selectively pivotally secured to said head on an axis parallel with or at right angles to the axis of said sheave.

PETER VAN HORNE SERRELL.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 

